Add SMM Variable implementation.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11151 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Protocol/SmmSwapAddressRange.h

@@ -0,0 +1,40 @@
+/** @file
+  The EFI_SMM_SWAP_ADDRESS_RANGE_PROTOCOL is related to EDK II-specific implementation 
+  and used to abstract the swap operation of boot block and backup block of FV in EFI 
+  SMM environment. This swap is especially needed when updating the boot block of FV. 
+  If a power failure happens during the boot block update, the swapped backup block 
+  (now the boot block) can boot the machine with the old boot block backed up in it. 
+  The swap operation is platform dependent, so other protocols such as SMM FTW (Fault 
+  Tolerant Write) should use this protocol instead of handling hardware directly.
+
+Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available under 
+the terms and conditions of the BSD License that accompanies this distribution.  
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.                                            
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 
+
+**/
+
+#ifndef __SMM_SWAP_ADDRESS_RANGE_H__
+#define __SMM_SWAP_ADDRESS_RANGE_H__
+
+#include <Protocol/SwapAddressRange.h>
+
+#define EFI_SMM_SWAP_ADDRESS_RANGE_PROTOCOL_GUID \
+  { \
+    0x67c4f112, 0x3385, 0x4e55, { 0x9c, 0x5b, 0xc0, 0x5b, 0x71, 0x7c, 0x42, 0x28 } \
+  }
+
+//
+// SMM Swap Address Range protocol structure is the same as Swap Address Range protocol.  
+// The SMM one is intend to run in SMM environment, which means it can be used by 
+// SMM drivers after ExitPmAuth. 
+// 
+typedef EFI_SWAP_ADDRESS_RANGE_PROTOCOL EFI_SMM_SWAP_ADDRESS_RANGE_PROTOCOL;
+
+extern EFI_GUID gEfiSmmSwapAddressRangeProtocolGuid;
+
+#endif